/*
Copyright 2018 The Kubernetes Authors.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package util

import (
	"fmt"
	"os"
	"os/exec"
	"strings"
)

// Exists checks whether the file or directory exists.
func Exists(path string) (bool, error) {
	if _, err := os.Stat(path); err != nil {
		if os.IsNotExist(err) {
			return false, nil
		}
		return false, err
	}
	return true, nil
}

// CopyFile copies file from src to dest
func CopyFile(srcFile, destFile string) error {
	if output, err := exec.Command("cp", "-f", srcFile, destFile).CombinedOutput(); err != nil {
		stderr := strings.TrimSpace(string(output))
		return fmt.Errorf("unable to copy file from %s -> %s (%s): %v", srcFile, destFile, stderr, err)
	}
	return nil
}
